Celestron 8i User Manual
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With your telescope set up, you are ready to use it for observing. This section covers visual observing hints
for both solar system and deep sky objects as well as general observing conditions which will affect your
ability to observe.
for both solar system and deep sky objects as well as general observing conditions which will affect your
ability to observe.
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Often, it is tempting to look at the Moon when it is full. At this
time, the face we see is fully illuminated and its light can be
overpowering. In addition, little or no contrast can be seen
during this phase.
time, the face we see is fully illuminated and its light can be
overpowering. In addition, little or no contrast can be seen
during this phase.
One of the best times to observe the Moon is during its partial
phases (around the time of first or third quarter). Long shadows
reveal a great amount of detail on the lunar surface. At low
power you will be able to see most of the lunar disk at one time.
The optional Reducer/Corrector lens allows for breath-taking
views of the entire lunar disk when used with a low power
eyepiece. Change to higher power (magnification) to focus in on
a smaller area. Choose the lunar tracking rate from the
phases (around the time of first or third quarter). Long shadows
reveal a great amount of detail on the lunar surface. At low
power you will be able to see most of the lunar disk at one time.
The optional Reducer/Corrector lens allows for breath-taking
views of the entire lunar disk when used with a low power
eyepiece. Change to higher power (magnification) to focus in on
a smaller area. Choose the lunar tracking rate from the
NexStar's MENU tracking rate options to keep the moon centered in the eyepiece even at high
magnifications.
magnifications.
Lunar Observing Hints
To increase contrast and bring out detail on the lunar surface, use filters. A yellow filter works well at
improving contrast while a neutral density or polarizing filter will reduce overall surface brightness and glare.
improving contrast while a neutral density or polarizing filter will reduce overall surface brightness and glare.
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Other fascinating targets include the five naked eye planets. You
can see Venus go through its lunar-like phases. Mars can reveal
a host of surface detail and one, if not both, of its polar caps.
You will be able to see the cloud belts of Jupiter and the great
Red Spot (if it is visible at the time you are observing). In
addition, you will also be able to see the moons of Jupiter as they
orbit the giant planet. Saturn, with its beautiful rings, is easily
visible at moderate power.
can see Venus go through its lunar-like phases. Mars can reveal
a host of surface detail and one, if not both, of its polar caps.
You will be able to see the cloud belts of Jupiter and the great
Red Spot (if it is visible at the time you are observing). In
addition, you will also be able to see the moons of Jupiter as they
orbit the giant planet. Saturn, with its beautiful rings, is easily
visible at moderate power.
Planetary Observing Hints
• Remember that atmospheric conditions are usually the
limiting factor on how much planetary detail will be
visible. So, avoid observing the planets when they are low on the horizon or when they are directly
over a source of radiating heat, such as a rooftop or chimney. See the "Seeing Conditions" section
later in this section.
visible. So, avoid observing the planets when they are low on the horizon or when they are directly
over a source of radiating heat, such as a rooftop or chimney. See the "Seeing Conditions" section
later in this section.
• To increase contrast and bring out detail on the planetary surface, try using Celestron eyepiece
filters.
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Although overlooked by many amateur astronomers, solar observation is both rewarding and fun. However,
because the Sun is so bright, special precautions must be taken when observing our star so as not to
damage your eyes or your telescope.
because the Sun is so bright, special precautions must be taken when observing our star so as not to
damage your eyes or your telescope.